Stepping of Athlon Mobile 2400+

[irenealan]

Hi all, I just got the 35w Mobile Athlon 2400+ and wonder what stepping do I get?

Here's what it listed:

AXMD2400FJQ4C

Also how can I check if it's a 35watt Mobile Athlon? Thanks.

 

[TheStu]

That isn't your stepping, the line underneath that, it consists of maybe 10 or so characters. The first 5 letters are the stepping.... Additionally by doing a google search on I think AMD CPU Identification Form you can download the pdf with CPU identification instructions.

 

[irenealan]

h the line below is:

IDYHA 0501BPMW

I tried searching for IDYHA stepping but all I found is that there are Mobile 2600+ with such steppings and they are running 45watt. So does that mean Newegg mailed a wrong chip to me as I am paying for a 35 watt Mobile 2400+?

Also I wonder with such stepping how well will the chip overclock?

 

[ts3433]

IQYHA is considered the best mobile stepping. I'm not sure how others fare. I have a PQYHA myself, but were I to try serious overclocking (which I have no reason to do now) I'd be limited by my board, so I can't give you any kind of data. (I have booted at 2.2GHz with about 1.5V, though. It's a 45W XPM2400.)

 

[irenealan]

Thanks for the info. I found such stepping in Google too and people also said it's the best stepping. But I don't know about mine since mine started with ID instead IQ! Thanks.

 

[Infernus]

My 2400XP-M is a IQZFA, been running at 2.3ghz @ 1.65V for over a year now but it's really a luck of the draw as of late.

 

[irenealan]

Can anyone else give me additional comments on the IDYHA stepping? Thanks.!

 

[Quentin]

Ha, funny! I was searching for "IDYHA" and turned up this thread by you, Irene! Anyway, as you know from your other thread I also have an IDYHA mobile, a 2600+ (45w) while you have a 2400+ (35w).

Since this thread is a week old you've probably discovered much of this but just in case here's what I've found out on IDYHA. It seems to be a fairly new stepping and there's not a consensus on how good it is. The few reports I've seen have been good up to 2.5GHz.

It would have been nice to get an IQYHA since they seem to be the best for going over 2.5GHz but now are pretty rare while IDYHA is a current stepping like AQYHA. There aren't many sure ways to get an IQYHA and even if you do it would be a major concern how the CPU was treated by its previous owner - and why is he selling it (some IQYHAs were duds)? Beside, it seems people are satisfied with IDYHA - I certainly am.

From your product number (OPN), AXMD2400FJQ4C, this is definitely a 35 watt mobile. The J right after AXMD2400F indicates 35 watt or actually 1.35V. (This is explained at http://www.thedigerati.us/info/amdcpuchart.html#xpm ) Q stands for 1.45V or 45w. Unfortunately your CPU is not listed at this link but I do know 45w 2400's exist and your OPN strongly indicates that's what you indeed have.

XP-M2200+ AXMD2200FJQ4C AQYHA0427DPOW (35w) (Bob)
XP-M2400+ AXMH2400FQQ4C AQYHA0440UPGW (45w) (Bob)
XP-M2600+ AXMG2600FQQ4C AQYHA0421FPMW (45w) (Bob)
XP-M2600+ AXMG2600FQQ4C IDYHA0502RPMW (45w) (Bob)
XP-M2400+ AXMD2400FJQ4C IDYHA0501BPMW (35w) (irenealan)

I've read that steppings that begin with "A" or "I" are the best because they are the cores (or dies) that are the closest to the center of the silicon wafer before it is separated into individual cores that go on to become CPUs. A "P" stepping would be toward the outside of the wafer. (Apparantly the best silicon is near the center.) I've only seen pictures of wafers but they are round like small dinner plates and cut up into 75 or so CPU cores. Our mobiles are Barton cores with 512KB of L2 cache so AMD doesn't get as many cores from a wafer as it used to when manufacturing Thoroughbred cores.

(In fact that's one reason they dropped the XP/Barton line and came out with the value Sempron family. All Socket A Semprons have 256K L2 - except for the 3000+ which still is a Barton - so AMD can get maybe 100 smaller cores from a wafer now and sell the Sempron cheaply.)

Anyway, I think we got good CPUs and shouldn't worry too much about it!

Good luck with your cute little Epox PC!